Signs of Healthy Social Development in Children: What the Research Says

Understanding what healthy social
development looks like — at each
developmental stage — is as important
as understanding what delayed or atypical
social development looks like. Research
on healthy social development provides
specific, evidence-based guidance about
the signs that a child’s social development
is on track — giving parents both
reassurance when development is progressing
well and a clear framework for identifying
when additional support may be needed.

This article covers what the research
shows about signs of healthy social
development in children — what to
look for at each age, what the signs
mean, and what parents can specifically do.

Why Knowing the Signs of Healthy
Development Matters

Research on child development and
parenting finds several specific reasons
why knowing the signs of healthy
social development is practically important:

Reassurance reduces parental anxiety.
Research finds that parents
who have accurate knowledge
of typical development — and
who can recognize that their
child’s development is on track —
show significantly less parenting
anxiety than those who lack
this framework.

Early identification is more
accurate with a clear baseline.
Research finds that parents
who know what healthy social
development looks like are
significantly better positioned
to identify when development
may need additional support —
because they have a clear
baseline against which to compare.

Celebrating healthy development
reinforces it. Research on
positive reinforcement and
development finds that noticing
and celebrating the signs of
healthy social development —
acknowledging prosocial behavior,
celebrating friendship milestones —
significantly reinforces that development.

Signs of Healthy Social Development
in Infants (Birth to Twelve Months)

Research on infant social development
identifies the following signs of
healthy development:

Responds to faces and voices —
particularly the primary caregiver’s —
from birth.

Social smiling — genuine smiling
in response to a social partner —
from approximately six weeks.

Engages in protoconversation —
back-and-forth vocal exchanges
with caregivers — from approximately two months.

Makes sustained eye contact
with caregivers.

Shows different responses to
familiar and unfamiliar people —
from approximately six months.

Shows stranger anxiety — from approximately eight months —
reflecting healthy attachment.

Uses social referencing —
looking to the caregiver for
emotional information — from approximately nine months.

Shows joint attention — following
the caregiver’s gaze and pointing —
from approximately nine to twelve months.

Shows affection toward familiar caregivers.

What these signs mean: the
infant is developing the social
attention, attachment, and social-cognitive
capacities that are the foundation
of all subsequent social development.

Signs of Healthy Social Development
in Toddlers (One to Three Years)

Research on toddler social development
identifies the following signs of
healthy development:

Shows clear preference for
familiar caregivers and family members.

Engages in parallel play —
playing alongside peers —
from approximately twelve to eighteen months.

Shows empathic responses —
attempting to comfort upset
others — from approximately fourteen months.

Imitates others’ actions —
both caregivers and peers.

Beginning to engage in cooperative
play — from approximately two years.

Shows interest in and curiosity
about peers.

Engages in pretend play —
simple make-believe — from approximately eighteen months.

Uses words to communicate
emotions — “sad,” “mad,” “happy” — from approximately eighteen months.

Shows separation anxiety —
and then calms when reunited
with the caregiver — reflecting healthy attachment.

Beginning to share and take
turns — with adult support.

What these signs mean: the
toddler is developing the social
interest, empathy, and beginning
cooperative skills that peer
relationships require.

Signs of Healthy Social Development
in Preschoolers (Three to Five Years)

Research on preschool social development
identifies the following signs of
healthy development:

Engages in cooperative play
with peers — working toward shared goals.

Engages in shared pretend
play — creating and sustaining
shared fantasy scenarios.

Shows genuine interest in
and preference for specific peers — beginning friendships.

Demonstrates theory of mind —
understanding that others have
different thoughts and feelings —
from approximately three to five years.

Shows empathy — responding
specifically to others’ emotional needs.

Beginning to resolve conflicts
with peers — with adult support.

Understands basic social rules —
sharing, turn-taking, not hurting others.

Shows appropriate separation
from caregivers — able to
separate for preschool or
playdate without excessive distress.

Engages comfortably with familiar adults.

What these signs mean: the
preschooler is developing the
theory of mind, empathy, and
cooperative skills that genuine
friendship requires.

Signs of Healthy Social Development
in School-Age Children (Six to Twelve Years)

Research on school-age social development
identifies the following signs of
healthy development:

Has at least one genuine reciprocal
friendship — a specific, preferred,
mutual peer relationship.

Maintains friendships over
time — friendships are relatively
stable rather than constantly changing.

Shows genuine interest in
and concern for friends’ wellbeing.

Navigates peer conflict —
can disagree with peers without
completely losing the relationship.

Shows appropriate peer cooperation —
in group activities, team sports, classroom work.

Demonstrates empathy — understanding
and responding to peers’ emotional experiences.

Shows appropriate emotional
regulation in social contexts —
can manage frustration and
disappointment without consistently
disrupting social interactions.

Understands and follows social
rules and norms.

Shows appropriate independence
from caregivers in social settings.

Can read social cues accurately —
understanding when peers are
interested, bored, upset, or annoyed.

What these signs mean: the
school-age child is developing
the genuine friendship capacity,
social competence, and peer
relationship skills that are
essential for social wellbeing.

Signs of Healthy Social Development
in Adolescents (Thirteen Plus)

Research on adolescent social development
identifies the following signs of
healthy development:

Maintains genuine close friendships —
with mutual trust, self-disclosure, and support.

Navigates the more complex
social world of adolescence —
peer groups, social hierarchies,
romantic relationships — with
reasonable competence.

Shows genuine empathy — including
for people in different circumstances.

Manages social conflict —
can navigate disagreements
and repair relationships.

Maintains appropriate family
relationships — while also
developing appropriate peer autonomy.

Shows developing social identity —
a sense of where they fit
in the social world.

Demonstrates appropriate social
perspective-taking — understanding
complex social situations from multiple viewpoints.

Can communicate effectively
in a range of social contexts.

What these signs mean: the
adolescent is developing the
social competence, genuine friendship
capacity, and social identity
that healthy adult social life requires.

Signs That Are Often Mistaken
for Social Development Problems

Research on social development
and parental concern identifies several
behaviors that are sometimes mistaken
for social development problems —
but are developmentally normal:

Parallel play in toddlers.
Research finds that toddlers
playing alongside rather than
with peers is completely normal —
not a sign of social difficulty.

Stranger anxiety in infants
and toddlers. Research finds
that stranger anxiety — and
separation anxiety — are signs
of healthy attachment — not social anxiety.

Occasional social conflict
in preschoolers. Research finds
that preschool conflict — over
toys, roles, rules — is completely
normal and developmentally important —
not a sign of social difficulty.

Preferring one or two close
friends over a large social
group. Research finds that
some children are naturally
more introverted — preferring
fewer, deeper friendships —
and that this is a healthy
social style — not a social development problem.

Shyness in new social situations.
Research finds that shyness —
wariness in new social situations —
is a normal temperament variant —
not a social development problem —
as long as the child can engage
comfortably once familiar.

Try This This Week

Practice 1 — The Healthy Development Celebration
What it is: A deliberate daily
practice of noticing and celebrating
signs of healthy social development —
reinforcing the development you observe.

How to do it: This week deliberately
notice and celebrate one sign
of healthy social development each day:

Empathy: “I noticed you comforted
[friend] when they were upset —
that was genuinely kind.”
Cooperation: “You and [friend]
worked really well together
on that — I loved watching you cooperate.”
Conflict resolution: “I noticed
you worked that out with [friend]
yourselves — that was really mature.”
Friendship: “It’s so lovely
that you and [friend] enjoy
each other so much.”

Why it works: Research on
positive reinforcement and social
development consistently finds
that noticing and specifically
acknowledging prosocial behavior —
rather than only responding
to social difficulties — significantly
reinforces healthy social development.

Practice 2 — The Developmental Stage Check
What it is: A deliberate honest
assessment of your child’s current
social development against the
age-appropriate signs of healthy development.

How to do it: This week review
the signs of healthy social
development for your child’s
current age — and honestly assess:

Which signs are clearly present?
Which signs are still developing?
Are there any signs that are
significantly absent — that
warrant monitoring or professional attention?

Use this assessment for reassurance —
and for identifying where additional support may help.

Why it works: Research on
parenting effectiveness consistently
finds that accurate developmental
assessment — using specific
age-appropriate criteria — produces
significantly more accurate
identification of both healthy
development and genuine concerns
than general impression.

Practice 3 — The Social Development Investment
What it is: A deliberate weekly
investment in the social development
experience most important for
your child’s current stage.

How to do it: Based on your
child’s current stage — facilitate
one specific stage-appropriate social experience:

Infant — serve-and-return interaction.
Toddler — unstructured parallel play with a peer.
Preschooler — cooperative play with a preferred peer.
School age — a genuine friendship activity.
Adolescent — a supported in-person social experience.

Why it works: Research on
social development consistently
finds that stage-appropriate
social experience — matched
to the child’s current developmental
level — produces the most significant
social development gains available.

The Bottom Line

Knowing the signs of healthy
social development — at each
developmental stage — is as
important as knowing the signs
of difficulty. Research is
clear: healthy social development
progresses through predictable
stages — from the infant’s
social smile to the adolescent’s
genuine close friendships —
and parents who can recognize
and celebrate healthy development
are significantly better positioned
to support it and to identify
when additional support may be needed.

Sources

Hartup, W. W. (1996).
The company they keep.
Child Development, 67(1), 1–13.

Bowlby, J. (1969).
Attachment and Loss: Vol. 1. Attachment.
Basic Books.

Gottman, J. M., & DeClaire, J.
(1997). Raising an Emotionally
Intelligent Child. Simon & Schuster.

Thompson, R. A. (2006).
The development of the person.
In W. Damon & R. M. Lerner (Eds.),
Handbook of Child Psychology. Wiley.